html{
    font-size:50px;
}
@num:15;
@media screen and (min-width:320px){
    html{
        font-size:(320px/@num);
    }
    
}
@media screen and (min-width:360px){
    html{
        font-size:(360px/@num);
    }
    
}
@media screen and (min-width:400px){
    html{
        font-size:(400px/@num);
    }
    
}
@media screen and (min-width:480px){
    html{
        font-size:(480px/@num);
    }
    
}
@media screen and (min-width:540px){
    html{
        font-size:(540px/@num);
    }
    
}

